28497766820 has 48 divisors (see below), whose sum is σ = 62866540800. Its totient is φ = 10830289536.

The previous prime is 28497766813. The next prime is 28497766837. The reversal of 28497766820 is 2866779482.

It is a self number, because there is not a number n which added to its sum of digits gives 28497766820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139352 + ... + 276431.

It is an arithmetic number, because the mean of its divisors is an integer number (1309719600).

Almost surely, 2^28497766820 is an apocalyptic number.

28497766820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28497766820 is an abundant number, since it is smaller than the sum of its proper divisors (34368773980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28497766820 is a wasteful number, since it uses less digits than its factorization.

28497766820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415964 (or 415962 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 59.

The spelling of 28497766820 in words is "twenty-eight billion, four hundred ninety-seven million, seven hundred sixty-six thousand, eight hundred twenty".